class_docstr: Base class for GNN module.
code: def forward(self, graph, node_feat):
      raise NotImplementedError("GNNBase: Not Implemented.")
  
file_path: graph4nlp/graph4nlp/pytorch/modules/graph_embedding_learning/base.py
imports: import abc
  import torch.nn
label_desc: Use image node_id 2 for calling the GNNBase obj's underlying member method code with example usage: obj.forward(graph, node_feat) without return types